精度

Detailed investigation have been made into the three important factors of part shape, deformation conditions and forming methods based on the overall analysis of influence of various factors on the forming accuracy of pressings.

本文在综合分析了各种因素对冲压件成形精度影响规律的基础上，对提高冲压件成形精度的三个重要因素包括零件形状、变形条件及冲压成形方法进行了详细的研究。

The precisions of the temperature and the density are 0.01℃ and 0.0001gcm^(-3), respectively.

其中系统温度的控制精度在0.01℃，密度的测量精度为0.0001 gcm^(-3)。

The results show that: the tensile strength, flexural strength and flexural modulus increase by about 10.4%, 62.1% and 122.3% respectively when the mass fraction of the aluminum powder increases from 0 to 50%, while elongation at break and impact strength decrease by about 65.0 and 74.4% respectively; the tensile strength, elongation at break and impact strength all increase with decreasing the particle sizes of the aluminum powders.b Nylon-12 coated metal powders for the indirect SLS process were prepared by the dissolution precipitation process. The coated powders have only 1.0 wt% nylon-12, and their SLS green parts have sufficient strength for features as small as 1.0 mm to be built and post-processed and high dimensional accuracy. The green parts were subjected to the post processing processes including binder decomposition and infiltration of epoxy resin, and then the metal/polymer composite parts with relatively high strength and accuracy were formed.At present, micron-scale inorganic fillers have been widely used to reinforce nylon SLS parts.

将该法制备的尼龙12覆膜金属粉末用于以下两个方面：a使用铝粉增强尼龙12的SLS成形件，通过溶剂沉淀法制备尼龙12覆膜铝复合粉末，研究了铝粉含量及粒径对SLS成形件性能的影响，结果表明：铝粉分散均匀，并与基体有良好的界面粘接；当铝粉含量从0增加到50wt％时，成形件的拉伸强度、弯曲强度、弯曲模量分别提高10.4％、62.1％和122.3％，冲击强度和断裂伸长率下降65.0％和74.4％，耐热性及尺寸精度也得到提高；断裂伸长率、冲击强度及拉伸强度均随着铝粉粒径的减小而增大。b使用溶剂沉淀法制备了间接法SLS用尼龙12覆膜金属粉末，该覆膜粉末中聚合物粘接剂的含量仅为1.0 wt％，其SLS初始形坯具有较高的精度以及足够满足后处理要求的强度，最小精细结构的尺寸达1.0 mm。

This paper analyzed the balance precision and grade of high speed grinding wheel and its effect on grinding performance analyzed. The unbalance causes of high and super high speed grinding wheel were discussed too. The evaluation and selection for the balance precision of high and super high speed grinding wheel were studied. Furthermore, the paper analyzed the principle and significance of dynamic balancing technology of high and super high grinding wheel.

对高速转子平衡精度和等级及其对磨削性能的影响进行了理论分析，并深入讨论了超高速砂轮系统的不平衡因素，研究了超高速砂轮系统平衡精度的评价与选择方法，分析讨论了盘形高速和超高速磨削砂轮动平衡技术的原理和意义。

For the application of Balance of heat loss with limit high ,we can choose low a balanced current, high voltage start a balanced, low accuracy, as well as reduce the number of the battery in series to reduce heat loss of balance; In the situation that heat capacity of the battery pack requirements is easy , You can choose a higher balance of the current, low voltage start a balanced, high precision balance, as well as more battery in series to increase the number of battery-balanced speed.

对均衡热损耗限制高的应用，可选择低均衡电流、较高的均衡启动电压、较低的均衡精度以及较少的同时均衡电池数来减低均衡热损耗；而在电池包热容量宽裕的情况下，可以选择较高的均衡电流、较低的均衡启动电压、较高的均衡精度以及较多的同时均衡电池数来提高均衡的速度。

The precision of gauge control of hot-rolled strip is directly affected by the calculating precision of rolling force model, where the rolling pressures in the models are mostly decomposed and become the product of the influence coefficient in stress state arid resistance to deformation.

轧制力模型的计算精度直接影响热轧带钢厚度控制精度，目前大多数轧制力模型都把轧制压力分解成应力状态影响系数和变形抗力的乘积。

Precision Grinding to the table as benchmark precision machinery can ensure long-term geometric precision.

以精密研磨的工作台面作为机器精度基准，可长久确保几何精度。

For one thing, a twofold increase in lens precision meant a twofold or even threefold increase in manufacturing precision. What's more, to meet the demands of future image sensors with even higher pixel counts, it would be necessary to boost interchangeable lens performance to the limit.

一方面，两倍高的镜头精度意味着两倍甚至三倍的制造精度；另一方面，为了配合今后开发的更高像素的传感器，必须将交互式镜头的性能发挥到极致。

This paper is finished based upon a part of the project ,which is the design of Delta-Sigma ADC in a high precision electrical meter chip .

本论文主要基于&一种高精度脉冲输出的电能计量集成电路&项目中关于Delta-Sigma模数转换器的设计部分，论文中在对Delta-Sigma模数转换器原理进行深入理解的基础上，提出了一种高精度Delta-Sigma模数转换器的解决方案，并运用于以上项目中取得很好的效果。

Based on image processing technique, automatic real-time meter precision calibration system can assure high precision of meter calibration, improve the product efficiency, which is helpful to control the product cost for enterprise with practical value.

应用图像处理技术对指示表的指示精度进行自动实时检定，可以确保指示表检定的高精度要求，提高劳动生产率，有利于企业控制产品质量，具有实用推广价值。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。